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公开(公告)号：US2947989A
公开(公告)日：1960-08-02
申请号：US62477556
申请日：1956-11-28
Applicant: RCA CORP
Inventor： FORD JOHN R , KRUGER IRVING D , HAROLD PERKEL
IPC: H01Q3/04
CPC classification number: H01Q3/04 , Y10S343/01
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